/usr/lib/ruby/1.8/mechanize/ is in libwww-mechanize-ruby1.8 1.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/1.8/mechanize/chain/
/usr/lib/ruby/1.8/mechanize/chain.rb
/usr/lib/ruby/1.8/mechanize/chain/auth_headers.rb
/usr/lib/ruby/1.8/mechanize/chain/body_decoding_handler.rb
/usr/lib/ruby/1.8/mechanize/chain/connection_resolver.rb
/usr/lib/ruby/1.8/mechanize/chain/custom_headers.rb
/usr/lib/ruby/1.8/mechanize/chain/handler.rb
/usr/lib/ruby/1.8/mechanize/chain/header_resolver.rb
/usr/lib/ruby/1.8/mechanize/chain/parameter_resolver.rb
/usr/lib/ruby/1.8/mechanize/chain/post_connect_hook.rb
/usr/lib/ruby/1.8/mechanize/chain/pre_connect_hook.rb
/usr/lib/ruby/1.8/mechanize/chain/request_resolver.rb
/usr/lib/ruby/1.8/mechanize/chain/response_body_parser.rb
/usr/lib/ruby/1.8/mechanize/chain/response_header_handler.rb
/usr/lib/ruby/1.8/mechanize/chain/response_reader.rb
/usr/lib/ruby/1.8/mechanize/chain/ssl_resolver.rb
/usr/lib/ruby/1.8/mechanize/chain/uri_resolver.rb
/usr/lib/ruby/1.8/mechanize/content_type_error.rb
/usr/lib/ruby/1.8/mechanize/cookie.rb
/usr/lib/ruby/1.8/mechanize/cookie_jar.rb
/usr/lib/ruby/1.8/mechanize/file.rb
/usr/lib/ruby/1.8/mechanize/file_response.rb
/usr/lib/ruby/1.8/mechanize/file_saver.rb
/usr/lib/ruby/1.8/mechanize/form/
/usr/lib/ruby/1.8/mechanize/form.rb
/usr/lib/ruby/1.8/mechanize/form/button.rb
/usr/lib/ruby/1.8/mechanize/form/check_box.rb
/usr/lib/ruby/1.8/mechanize/form/field.rb
/usr/lib/ruby/1.8/mechanize/form/file_upload.rb
/usr/lib/ruby/1.8/mechanize/form/image_button.rb
/usr/lib/ruby/1.8/mechanize/form/multi_select_list.rb
/usr/lib/ruby/1.8/mechanize/form/option.rb
/usr/lib/ruby/1.8/mechanize/form/radio_button.rb
/usr/lib/ruby/1.8/mechanize/form/select_list.rb
/usr/lib/ruby/1.8/mechanize/headers.rb
/usr/lib/ruby/1.8/mechanize/history.rb
/usr/lib/ruby/1.8/mechanize/inspect.rb
/usr/lib/ruby/1.8/mechanize/monkey_patch.rb
/usr/lib/ruby/1.8/mechanize/page/
/usr/lib/ruby/1.8/mechanize/page.rb
/usr/lib/ruby/1.8/mechanize/page/base.rb
/usr/lib/ruby/1.8/mechanize/page/frame.rb
/usr/lib/ruby/1.8/mechanize/page/image.rb
/usr/lib/ruby/1.8/mechanize/page/label.rb
/usr/lib/ruby/1.8/mechanize/page/link.rb
/usr/lib/ruby/1.8/mechanize/page/meta.rb
/usr/lib/ruby/1.8/mechanize/pluggable_parsers.rb
/usr/lib/ruby/1.8/mechanize/redirect_limit_reached_error.rb
/usr/lib/ruby/1.8/mechanize/redirect_not_get_or_head_error.rb
/usr/lib/ruby/1.8/mechanize/response_code_error.rb
/usr/lib/ruby/1.8/mechanize/unsupported_scheme_error.rb
/usr/lib/ruby/1.8/mechanize/util.rb